JP6762865B2 - Heat dissipation structure of vehicle lighting equipment - Google Patents

Heat dissipation structure of vehicle lighting equipment Download PDF

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JP6762865B2
JP6762865B2 JP2016243009A JP2016243009A JP6762865B2 JP 6762865 B2 JP6762865 B2 JP 6762865B2 JP 2016243009 A JP2016243009 A JP 2016243009A JP 2016243009 A JP2016243009 A JP 2016243009A JP 6762865 B2 JP6762865 B2 JP 6762865B2
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研二 秋貞
研二 秋貞
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Stanley Electric Co Ltd
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Description

本発明は、ダクトに内設された放熱器の放熱をダクト内を流れる空気によって促進することによって光源を冷却する車両用灯具の放熱構造に関するものである。 The present invention relates to a heat dissipation structure of a vehicle lamp that cools a light source by promoting heat dissipation of a radiator installed in a duct by air flowing through the duct.

近年、車両の前部左右に配置されるヘッドランプ等の車両用灯具の光源として、発光効率が高くて高輝度、省電力等の利点を有するＬＥＤ（発光ダイオード）等の半導体発光素子が使用されつつある。この種の半導体発光素子は、前記利点を有する反面、発熱によって高温になり易く、その温度が高くなると発光効率と寿命が低下するという問題を有している。 In recent years, semiconductor light emitting elements such as LEDs (light emitting diodes), which have advantages such as high luminous efficiency, high brightness, and power saving, have been used as light sources for vehicle lamps such as headlamps arranged on the left and right sides of the front of the vehicle. It's starting. While this type of semiconductor light emitting device has the above-mentioned advantages, it tends to reach a high temperature due to heat generation, and when the temperature rises, there is a problem that the luminous efficiency and the life are lowered.

そこで、光源として半導体発光素子を使用する車両用灯具においては、半導体発光素子を適当な手段によって冷却する必要がある。このため、例えば、特許文献１には、図７に示す放熱構造が提案されている。 Therefore, in a vehicle lamp that uses a semiconductor light emitting element as a light source, it is necessary to cool the semiconductor light emitting element by an appropriate means. Therefore, for example, Patent Document 1 proposes a heat dissipation structure shown in FIG. 7.

即ち、図７は特許文献１において提案された車両用灯具の放熱構造を示す縦断面図であり、図示の放熱構造においては、ヘッドランプ等の車両用灯具１０１のハウジング１０２に沿ってダクト１０３を配置するとともに、光源であるＬＥＤ１０４が発生する熱を放熱するためのヒートシンク等の熱交換部１０５を前記ダクト１０３内に配置する構成が採用されている。 That is, FIG. 7 is a vertical cross-sectional view showing the heat dissipation structure of the vehicle lighting fixture proposed in Patent Document 1. In the illustrated heat dissipation structure, the duct 103 is provided along the housing 102 of the vehicle lighting fixture 101 such as a headlamp. In addition to arranging the lamps, a heat exchange unit 105 such as a heat sink for radiating heat generated by the LED 104 as a light source is arranged in the duct 103.

斯かる放熱構造において、車両用灯具１０１の点灯時にＬＥＤ１０４が発生する熱は、車両の走行によって発生する走行風がダクト１０３の吸気口１０３ａから流入して排気口１０３ｂから排出される過程で、熱交換部１０５における走行風との熱交換によって放熱されるため、ＬＥＤ１０４が冷却されてその発光効率と寿命の低下が防がれる。 In such a heat dissipation structure, the heat generated by the LED 104 when the vehicle lighting tool 101 is lit is the heat generated in the process in which the traveling wind generated by the traveling of the vehicle flows in from the intake port 103a of the duct 103 and is discharged from the exhaust port 103b. Since heat is dissipated by heat exchange with the traveling wind in the switching unit 105, the LED 104 is cooled and its luminous efficiency and life are prevented from being lowered.

しかしながら、上記放熱構造にあっては、車両が停止しているためにダクト１０３内を走行風が流れないときには、熱交換部１０５が熱交換機能を発揮することができず、エンジンルーム１０６内の熱風が排気口１０３ｂからダクト１０３内に逆流して熱交換部１０５を加熱するため、ＬＥＤ１０４を効果的に冷却することができないという問題がある。 However, in the above heat dissipation structure, when the traveling wind does not flow in the duct 103 because the vehicle is stopped, the heat exchange unit 105 cannot exert the heat exchange function and is in the engine room 106. Since hot air flows back from the exhaust port 103b into the duct 103 to heat the heat exchange section 105, there is a problem that the LED 104 cannot be effectively cooled.

そこで、特許文献２には、図８に示す放熱構造が提案されている。 Therefore, Patent Document 2 proposes a heat dissipation structure shown in FIG.

即ち、図８は特許文献２において提案された車両用灯具の放熱構造を示す縦断面図であり、図示の放熱構造においては、ヘッドランプ等の車両用灯具２０１のハウジング２０２に沿ってダクト２０３が配置されるとともに、光源である上下２つのＬＥＤ２０４が発生する熱を放熱するためのヒートシンク２０５が前記ダクト２０３内に配置され、各ＬＥＤ２０４とヒートシンク２０５とが熱伝導部２０６によって接続されている。又、ダクト２０３には吸気口２０３ａと排気口２０３ｂの他、強制排気口２０３ｃが開口しており、この強制排気口２０３ｃの近傍には、排気手段である排気ファン２０７が配置されている。 That is, FIG. 8 is a vertical sectional view showing the heat dissipation structure of the vehicle lighting equipment proposed in Patent Document 2. In the illustrated heat dissipation structure, the duct 203 is provided along the housing 202 of the vehicle lighting equipment 201 such as a headlamp. A heat sink 205 for radiating heat generated by the two upper and lower lamps 204, which are light sources, is arranged in the duct 203, and each LED 204 and the heat sink 205 are connected by a heat conductive portion 206. Further, in addition to the intake port 203a and the exhaust port 203b, the forced exhaust port 203c is opened in the duct 203, and an exhaust fan 207 which is an exhaust means is arranged in the vicinity of the forced exhaust port 203c.

更に、前記ダクト２０３の排気口２０３ｂには、該排気口２０３ｂを開閉する開閉部２０８が設けられており、この開閉部２０８は、シリンダ２０９のロッド２０９ａに連結されている。そして、シリンダ２０９と排気ファン２０７には制御部２１０が接続されており、この制御部２１０には、当該車両用灯具２０１を搭載した車両の速度を検出する車速センサ２１１が接続されている。 Further, the exhaust port 203b of the duct 203 is provided with an opening / closing portion 208 for opening / closing the exhaust port 203b, and the opening / closing portion 208 is connected to a rod 209a of the cylinder 209. A control unit 210 is connected to the cylinder 209 and the exhaust fan 207, and a vehicle speed sensor 211 that detects the speed of the vehicle equipped with the vehicle lighting tool 201 is connected to the control unit 210.

斯かる放熱構造においては、車速センサ２１１によって検出された車速に基づいて、ダクト２０３内を流れる空気の流速を算出し、この流速がファン平均流速よりも遅い場合には、制御部２１０がシリンダ２０９を駆動して開閉部２０８を駆動して図示のようにダクト２０３の排気口２０３ｂを閉じるとともに、排気ファン２０７を駆動してダクト２０３の吸気口２０３ａから空気を取り込んで強制排気口２０３ｃから空気を強制的に排出することによって、ダクト２０３内に空気の流れを誘起するようにしている。 In such a heat dissipation structure, the flow velocity of the air flowing in the duct 203 is calculated based on the vehicle speed detected by the vehicle speed sensor 211, and when this flow velocity is slower than the fan average flow velocity, the control unit 210 controls the cylinder 209. As shown in the figure, the exhaust port 203b of the duct 203 is closed, and the exhaust fan 207 is driven to take in air from the intake port 203a of the duct 203 and to take in air from the forced exhaust port 203c. The air flow is induced in the duct 203 by forcibly discharging the air.

従って、車速が遅い場合又は車両が停止している場合であっても、ダクト２０３内に空気の流れが発生するため、ヒートシンク２０５の放熱が促進され、このヒートシンク２０５に熱伝導部２０６を介して接続された各ＬＥＤ２０４が冷却されてその温度上昇が抑えられる。 Therefore, even when the vehicle speed is slow or the vehicle is stopped, air flow is generated in the duct 203, so that heat dissipation of the heat sink 205 is promoted, and the heat sink 205 is connected to the heat sink 205 via the heat conductive portion 206. Each connected LED 204 is cooled and its temperature rise is suppressed.

特開２００８−２２６８４３号公報Japanese Unexamined Patent Publication No. 2008-226843 特開２００６−２８６３９５号公報Japanese Unexamined Patent Publication No. 2006-286395

しかしながら、特許文献２において提案された図８に示す車両用灯具の放熱構造においては、エンジンルームの過酷な環境下に設置された排気ファン２０７には、高い耐熱性、防水性、防塵性、耐振性等が求められる他、車速（ダクト２０３内の空気の流速）に応じて開閉部２０８と排気ファン２０７の駆動を制御するための制御系が複雑化するため、大幅なコストアップを招くという問題がある。 However, in the heat dissipation structure of the vehicle lamp shown in FIG. 8 proposed in Patent Document 2, the exhaust fan 207 installed in the harsh environment of the engine room has high heat resistance, waterproofness, dustproofness, and vibration resistance. In addition to the need for properties, the control system for controlling the drive of the opening / closing unit 208 and the exhaust fan 207 according to the vehicle speed (flow velocity of air in the duct 203) becomes complicated, which causes a significant cost increase. There is.

又、排気ファン２０７が故障した場合には、車両の低速走行時及び停止時の冷却性能が不足し、ＬＥＤ２０４の温度上昇を招くという問題がある。 Further, when the exhaust fan 207 fails, there is a problem that the cooling performance when the vehicle is running at low speed and when the vehicle is stopped is insufficient, which causes the temperature of the LED 204 to rise.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、車両の停止時においても簡単な構成によって所要の放熱性能を確保して光源の温度上昇を抑えることができる車両用灯具の放熱構造を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is a vehicle lamp capable of ensuring the required heat dissipation performance and suppressing the temperature rise of the light source even when the vehicle is stopped by a simple configuration. The purpose is to provide a heat dissipation structure.

上記目的を達成するため、請求項１記載の発明は、光源と、該光源で発生する熱を放熱する放熱器を備える車両用灯具の放熱構造であって、一端が吸気口として開口する吸気部と上下方向に延びる放熱部及び一端が排気口として開口する排気部を備えるダクトの前記放熱部に前記放熱器を内設し、前記吸気口から前記ダクト内に流入して前記排気口から排出される空気によって前記放熱器の放熱を促進して前記光源を冷却する車両用灯具の放熱構造において、前記ダクトの前記吸気部と前記放熱部及び前記排気部の壁面の断熱性に差を設けたことを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a heat dissipation structure of a vehicle lamp including a light source and a radiator for radiating heat generated by the light source, and an intake portion having one end opened as an intake port. The radiator is internally installed in the heat dissipation part of a duct having a heat dissipation part extending in the vertical direction and an exhaust part having one end opened as an exhaust port, and flows into the duct from the intake port and is discharged from the exhaust port. In the heat dissipation structure of the vehicle lamp that promotes the heat dissipation of the radiator and cools the light source by the air, a difference is provided in the heat insulating properties of the wall surfaces of the intake portion, the heat dissipation portion, and the exhaust portion of the duct. It is characterized by.

請求項２記載の発明は、請求項１記載の発明において、前記ダクトの前記排気部を車両のエンジンルーム側とフロントグリル側に跨って配置し、同ダクトの前記吸気部と前記放熱部の壁面の断熱性を高く設定し、前記排気部のエンジンルーム側に位置する部位の壁面の断熱性を低く設定し、同排気部のフロントグリル側に位置する部位の壁面の断熱性を高く設定したことを特徴とする。 The invention according to claim 2 is the invention according to claim 1, wherein the exhaust portion of the duct is arranged so as to straddle the engine room side and the front grill side of the vehicle, and the wall surface of the intake portion and the heat dissipation portion of the duct. The heat insulation of the wall surface of the part located on the engine room side of the exhaust part was set high, and the heat insulation property of the wall surface of the part located on the front grill side of the exhaust part was set high. It is characterized by.

請求項３記載の発明は、請求項１記載の発明において、前記ダクトを車両のフロントグリル側に配置し、同ダクトの前記吸気部の壁面の断熱性を高く設定し、前記放熱部の壁面の断熱性を低く設定し、前記排気部の壁面の断熱性を高く設定したことを特徴とする。 The invention according to claim 3 is the invention according to claim 1, wherein the duct is arranged on the front grill side of the vehicle, the heat insulating property of the wall surface of the intake portion of the duct is set to be high, and the wall surface of the heat radiating portion is set high. It is characterized in that the heat insulating property is set low and the heat insulating property of the wall surface of the exhaust portion is set high.

請求項４記載の発明は、請求項１記載の発明において、エンジンルームの温度が低い車両に設けられる放熱構造であって、前記ダクトの前記吸気部の壁面の断熱性を高く設定し、前記放熱部の壁面の断熱性を低く設定し、前記排気部の壁面の断熱性を高く設定したことを特徴とする。 The invention according to claim 4 is the invention according to claim 1, which is a heat dissipation structure provided in a vehicle having a low engine room temperature, and has a high heat insulating property on the wall surface of the intake portion of the duct to dissipate heat. It is characterized in that the heat insulating property of the wall surface of the portion is set low and the heat insulating property of the wall surface of the exhaust portion is set high.

請求項５記載の発明は、請求項１〜４の何れかに記載の発明において、前記ダクトの排気口を車両のエンジンルームのフロントグリルとコンデンサ及びラジエータとの間に開口させたことを特徴とする。 The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the exhaust port of the duct is opened between the front grille of the engine room of the vehicle and the condenser and the radiator. To do.

請求項１〜４記載の発明によれば、ダクトの吸気部と放熱部及び排気部の壁面の断熱性に差を設けたため、ダクトの排気部の平均空気温度と排気口の周囲の空気温度との差を大きくしてダクト内の吸気速度を高くすることができる。このため、放熱器の対流熱伝達率が高められて放熱性能が向上し、放熱器からの放熱によって光源の温度が低く抑えられてその発光効率と寿命の低下が防がれる。そして、このような効果は、ファン等の機器を別途要することなく簡単な構成によって得られるため、大幅なコストアップや構造の複雑化を招くことがない
請求項５記載の発明によれば、車両の停止時においても温度が比較的低くて車両前方への熱風の回り込みが殆どないエンジンルーム内のフロントグリルとコンデンサ及びラジエータとの間にダクトの排気口を開口させたため、熱風がダクトの排気口から流入して該ダクト内を逆流することがない。このため、放熱器の放熱性能が熱風によって阻害されることがなく、放熱器の放熱が自然空冷によって促進されて光源の温度上昇が効果的に抑えられる。 According to the inventions of claims 1 to 4, since the heat insulating properties of the intake portion of the duct, the heat radiating portion, and the wall surface of the exhaust portion are different, the average air temperature of the exhaust portion of the duct and the air temperature around the exhaust port are different from each other. It is possible to increase the intake speed in the duct by increasing the difference between the two. Therefore, the convective heat transfer coefficient of the radiator is increased to improve the heat dissipation performance, and the temperature of the light source is suppressed to be low by the heat radiation from the radiator, and the luminous efficiency and the life of the radiator are prevented from being lowered. According to the invention of claim 5, since such an effect can be obtained by a simple configuration without requiring a separate device such as a fan, the vehicle does not significantly increase the cost or complicate the structure. Even when the engine is stopped, the temperature is relatively low and there is almost no wraparound of hot air to the front of the vehicle. The exhaust port of the duct is opened between the front grille in the engine room and the condenser and radiator, so the hot air enters the exhaust port of the duct. It does not flow in from the duct and flow back in the duct. Therefore, the heat dissipation performance of the radiator is not impaired by the hot air, the heat dissipation of the radiator is promoted by natural air cooling, and the temperature rise of the light source is effectively suppressed.

車両の半裁正面図である。It is a half-cut front view of a vehicle. 本発明の実施の形態１係る車両用灯具の放熱構造を示す斜視図である。It is a perspective view which shows the heat dissipation structure of the vehicle lamp according to Embodiment 1 of this invention. 本発明の実施の形態１に係る車両用灯具の放熱構造を示す平断面図である。FIG. 5 is a plan sectional view showing a heat dissipation structure of a vehicle lamp according to a first embodiment of the present invention. 本発明の実施の形態１に係る車両用灯具の放熱構造を示す正面図である。It is a front view which shows the heat dissipation structure of the vehicle lamp which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る車両用灯具の放熱構造を示す正面図である。It is a front view which shows the heat dissipation structure of the vehicle lamp which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る車両用灯具の放熱構造を示す正面図である。It is a front view which shows the heat dissipation structure of the vehicle lamp which concerns on Embodiment 3 of this invention. 特許文献１において提案された車両用灯具の放熱構造を示す縦断面図である。It is a vertical cross-sectional view which shows the heat dissipation structure of the vehicle lighting equipment proposed in Patent Document 1. 特許文献２において提案された車両用灯具の放熱構造を示す縦断面図である。It is a vertical cross-sectional view which shows the heat dissipation structure of the vehicle lighting equipment proposed in Patent Document 2.

以下に本発明の実施の形態を添付図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は車両の半裁正面図であり、図示の車両２０の前部左右には、ヘッドランプとして使用される車両用灯具１（図１には左側のもののみ図示）が配置されている。そして、この車両用灯具１の前面の中央部には、不図示のエンジンルーム内に外気（走行風）を取り入れるためのルーバー状のフロントグリル２１が配置されており、その下方にはフロントバンパ２２が車幅方向に水平に配置されている。尚、図１において、２３はエンジンルームの上部を覆うボンネット、２４はフロントガラス、２５は左右の前輪（図１には一方のみ図示）、２６は左右のサイドミラーである。 FIG. 1 is a half-cut front view of the vehicle, and vehicle lamps 1 used as headlamps (only the one on the left side is shown in FIG. 1) are arranged on the left and right sides of the front portion of the illustrated vehicle 20. A louver-shaped front grill 21 for taking in outside air (running wind) is arranged in an engine room (not shown) in the central portion of the front surface of the vehicle lighting tool 1, and a front bumper 22 is arranged below the louver-shaped front grill 21. Are arranged horizontally in the vehicle width direction. In FIG. 1, 23 is a bonnet covering the upper part of the engine room, 24 is a windshield, 25 is left and right front wheels (only one is shown in FIG. 1), and 26 is left and right side mirrors.

ここで、図示しないが、車両２０のエンジンルーム内には、エンジンが搭載されており、このエンジンの前方には、前方からエアコンのコンデンサ、ラジエータ、ラジエータファンが順次配置され、これらの前方に前記フロントグリル２１が配置され、左右の前記車両用灯具１が配置されている。 Here, although not shown, an engine is mounted in the engine room of the vehicle 20, and an air conditioner condenser, a radiator, and a radiator fan are sequentially arranged in front of the engine in front of the engine. The front grill 21 is arranged, and the left and right vehicle lighting tools 1 are arranged.

ところで、車両２０の停止時において外気温度が例えば４０℃である場合には、エンジンルーム内の温度は約７０°〜１００℃となる。そして、エンジンの発熱やラジエータファンの駆動によって発生する熱風は、エンジンルームから主に車体底部やタイヤハウス付近を通って車外へと排出される。 By the way, when the outside air temperature is, for example, 40 ° C. when the vehicle 20 is stopped, the temperature in the engine room is about 70 ° C. to 100 ° C. Then, the hot air generated by the heat generated by the engine and the drive of the radiator fan is discharged from the engine room to the outside of the vehicle mainly through the bottom of the vehicle body and the vicinity of the tire house.

次に、本発明に係る車両用灯具１の放熱構造の実施の形態について説明する。 Next, an embodiment of the heat dissipation structure of the vehicle lamp 1 according to the present invention will be described.

＜実施の形態１＞
図２は本発明の実施の形態１に係る車両用灯具の放熱構造を示す斜視図、図３は同放熱構造を示す平断面図、図４は同放熱構造を示す正面図である。尚、以下においては、一方（左側）の車両用灯具１の放熱構造について図示及び説明するが、他方（右側）の車両用灯具の放熱構造は同じであるため、これについての図示及び説明は省略する。 <Embodiment 1>
FIG. 2 is a perspective view showing a heat dissipation structure of the vehicle lamp according to the first embodiment of the present invention, FIG. 3 is a plan sectional view showing the heat dissipation structure, and FIG. 4 is a front view showing the heat dissipation structure. In the following, the heat dissipation structure of one (left side) vehicle lighting equipment 1 will be illustrated and described, but since the heat dissipation structure of the other (right side) vehicle lighting equipment is the same, the illustration and description thereof will be omitted. To do.

ヘッドランプとして使用される車両用灯具１は、図３に示すように、ハウジング２とその前面開口部を覆う透明なアウタレンズ３によって画成された灯室４内に、左右方向に並設された３つのランプモジュール５、光源である３つの半導体発光素子６、エクステンション７等を収容して構成されている。ここで、３つの半導体発光素子６は、ハウジング２の車両内側（図３の右側）に車両前後方向（図３の上下方向）に沿って適当な間隔で配置されており、各半導体発光素子６は、伝送ファイバ８を介して各ランプモジュール５にそれぞれ接続されている。又、各ランプモジュール５は、蛍光体９と配光制御用のレンズ１０を備えている。尚、ヘッドランプとして使用される車両用灯具１が白色光を出射する場合には、各半導体素子６には青色ＬＥＤが使用され、各蛍光体９には黄色蛍光体がそれぞれ使用される。 As shown in FIG. 3, vehicle lamps 1 used as headlamps are arranged side by side in the lighting chamber 4 defined by a transparent outer lens 3 covering the housing 2 and its front opening. It is configured to accommodate three lamp modules 5, three semiconductor light emitting elements 6 as light sources, an extension 7, and the like. Here, the three semiconductor light emitting elements 6 are arranged inside the vehicle (right side in FIG. 3) of the housing 2 at appropriate intervals along the vehicle front-rear direction (vertical direction in FIG. 3), and each semiconductor light emitting element 6 is arranged. Is connected to each lamp module 5 via a transmission fiber 8. Further, each lamp module 5 includes a phosphor 9 and a lens 10 for controlling light distribution. When the vehicle lamp 1 used as a headlamp emits white light, a blue LED is used for each semiconductor element 6, and a yellow phosphor is used for each phosphor 9.

ところで、図２〜図４に示すように、ハウジング２の車両内側の側壁には、ハウジング２の外部に配置された放熱器としてのヒートシンク１１が組み込まれている。このヒートシンク１１は、図３に示すように、ハウジング２の側壁に組み込まれた平板状のベース１１ａと、該ベース１１ａから車両内側に向かって垂直に立設された複数枚の放熱フィン１１ｂによって構成されている。ここで、複数枚の放熱フィン１１ｂは、図５に示すように、上下方向に長い薄板状の部材であって、これらは車両前後方向（図３の上下方向に沿って適当な間隔で配置されている。尚、ヒートシンク１１は、熱伝導性の高いアルミニウム合金やマグネシウム合金によって構成されている。 By the way, as shown in FIGS. 2 to 4, a heat sink 11 as a radiator arranged outside the housing 2 is incorporated in the side wall of the housing 2 inside the vehicle. As shown in FIG. 3, the heat sink 11 is composed of a flat plate-shaped base 11a incorporated in the side wall of the housing 2 and a plurality of heat radiation fins 11b vertically erected from the base 11a toward the inside of the vehicle. Has been done. Here, as shown in FIG. 5, the plurality of heat radiating fins 11b are thin plate-shaped members long in the vertical direction, and these are arranged in the vehicle front-rear direction (appropriately spaced along the vertical direction in FIG. 3). The heat sink 11 is made of an aluminum alloy or a magnesium alloy having high thermal conductivity.

ここで、図３に示すように、各半導体発光素子６が実装された計３つの基板１２は、熱伝導性の高い平板状の放熱ベース１３に取り付けられており、放熱ベース１３は、ヒートシンク１１のベース１１ａに密着した状態で取り付けられている。 Here, as shown in FIG. 3, a total of three substrates 12 on which each semiconductor light emitting element 6 is mounted are attached to a flat plate-shaped heat radiating base 13 having high thermal conductivity, and the heat radiating base 13 is a heat sink 11. It is attached in close contact with the base 11a of the above.

そして、車両２０のエンジンルーム内には、正面視横Ｕ字状に屈曲するダクト１４が配置されており、このダクト１４は、図４に示すように、略水平な吸気部１４Ａと、ハウジング２の内側壁に沿って垂直に起立する放熱部１４Ｂと、該放熱部１４Ｂから車両内側（図４の右側）に向かって斜め上方に延びる排気部１４Ｃとで構成されている。 A duct 14 that bends in a horizontal U shape in front view is arranged in the engine room of the vehicle 20, and the duct 14 has a substantially horizontal intake portion 14A and a housing 2 as shown in FIG. It is composed of a heat radiating portion 14B that stands vertically along the inner side wall of the housing, and an exhaust portion 14C that extends diagonally upward from the radiating portion 14B toward the inside of the vehicle (right side in FIG. 4).

ここで、ダクト１４の吸気部１４Ａの一端は、図１に示すように、吸気口１４ａとして車両２０の前面（フロントグリル２１の一部）に開口しており、排気部１４Ｃの一端（上端）は、排気口１４ｂとして不図示のエンジンルーム内のフロントグリルとコンデンサ及びラジエータとの間に開口している。そして、ダクト１４の垂直に起立する放熱部１４Ｂに前記ヒートシンク１１が内設されている。 Here, as shown in FIG. 1, one end of the intake portion 14A of the duct 14 is opened to the front surface (a part of the front grill 21) of the vehicle 20 as the intake port 14a, and one end (upper end) of the exhaust portion 14C. Is open as an exhaust port 14b between the front grille in the engine room (not shown) and the condenser and the radiator. The heat sink 11 is internally provided in the heat radiating portion 14B that stands vertically in the duct 14.

ところで、本実施の形態では、図４に示すように、ダクト１４の吸気部１４Ａと排気部１４Ｂは、車両２０のエンジンルーム側とフロントグリル側に跨って配置されており、ダクト１４の吸気部１４Ａと放熱部１４Ｂ及び排気部１４Ｃの各壁面の断熱性に差が設けられている。具体的には、ダクト１４の吸気部１４Ａと放熱部１４Ｂの壁面の断熱性は従来よりも高く設定され、排気部１４Ｃのエンジンルーム側に位置する部位の壁面の断熱性は従来よりも低く設定され、同排気部１４Ｃのフロントグリル側に位置する部位の壁面の断熱性は従来よりも高く設定されている。因みに、従来のダクトの壁面の断熱性は、その部位に関わらず一定に設定されていた。 By the way, in the present embodiment, as shown in FIG. 4, the intake portion 14A and the exhaust portion 14B of the duct 14 are arranged so as to straddle the engine room side and the front grill side of the vehicle 20, and the intake portion of the duct 14 There is a difference in the heat insulating properties of the wall surfaces of 14A, the heat radiating section 14B, and the exhaust section 14C. Specifically, the heat insulating properties of the walls of the intake portion 14A and the heat radiating portion 14B of the duct 14 are set higher than before, and the heat insulating properties of the wall surface of the portion located on the engine room side of the exhaust portion 14C are set lower than before. Therefore, the heat insulating property of the wall surface of the portion of the exhaust portion 14C located on the front grill side is set higher than before. By the way, the heat insulating property of the wall surface of the conventional duct is set to be constant regardless of the portion.

ここで、ダクト１４は、ハウジング２と同様にポリプロピレン（ＰＰ）等の樹脂によって構成されているが、その壁面の断熱性を変化させる手法としては、該ダクト１４の厚さや材質を変える方法や、壁面に表面処理を施したり、別部材を追加する方法、或いはダクト１４の構成自体を変える方法等が考えられる。 Here, the duct 14 is made of a resin such as polypropylene (PP) like the housing 2, but as a method of changing the heat insulating property of the wall surface, a method of changing the thickness or material of the duct 14 or a method of changing the thickness or material of the duct 14 is used. A method of applying a surface treatment to the wall surface, a method of adding another member, a method of changing the structure of the duct 14 itself, or the like can be considered.

具体的には、ダクト１４の厚さを変える手法では、ダクト１４の厚さが厚いほど断熱性が上がり、薄いほど断熱性が下がる。又、ダクト１４の材質を変える手法では、例えば樹脂に金属や金属酸化物等の熱伝導材料を複合化させて熱伝導率の高い熱伝導性樹脂を用いたり、ダクト１４の一部を金属製材料によって構成して断熱性を下げる。 Specifically, in the method of changing the thickness of the duct 14, the thicker the duct 14, the higher the heat insulating property, and the thinner the duct 14, the lower the heat insulating property. Further, in the method of changing the material of the duct 14, for example, a heat conductive material having a high thermal conductivity is used by compounding a heat conductive material such as a metal or a metal oxide with a resin, or a part of the duct 14 is made of metal. It is composed of materials to reduce heat insulation.

ダクト１４は、エンジンルームの高温環境から対流と放射によって熱の授受を行っているが、その表面の放射率によって断熱性を変化させることができるため、該ダクト１４に表面処理を施すことによって断熱性を変化させる手法においては、表面にセラミック材料等を用いた放射率の低い材料を塗布することによって断熱性を上げることができる。又、黒体塗料に代表されるような放射率の高い材料をダクト１４の表面に塗布することによって断熱性を下げたり、熱交換塗料等の遮熱塗料を用いてダクト１４の断熱性を上げても良い。 The duct 14 transfers heat by convection and radiation from the high temperature environment of the engine room, but since the heat insulating property can be changed by the emissivity of the surface, the duct 14 is heat-insulated by applying a surface treatment. In the method of changing the property, the heat insulating property can be improved by applying a material having a low emissivity such as a ceramic material to the surface. Further, the heat insulating property is lowered by applying a material having a high emissivity such as black body paint to the surface of the duct 14, and the heat insulating property of the duct 14 is improved by using a heat insulating paint such as a heat exchange paint. You may.

更に、ダクト１４に別部材を追加して断熱性を変化させる手法においては、該ダクト１４の表面にガラス繊維テープ等の断熱部材を取り付けて断熱性を上げる方法が考えられ、ダクト１４の構成自体を変える手法においては、ダクト１４を二重構造として間に空気層を挟むことによって断熱性を上げる方法が考えられる。 Further, in a method of adding another member to the duct 14 to change the heat insulating property, a method of attaching a heat insulating member such as a glass fiber tape to the surface of the duct 14 to improve the heat insulating property is conceivable, and the structure of the duct 14 itself. In the method of changing the above, a method of increasing the heat insulating property by forming the duct 14 as a double structure and sandwiching an air layer between them can be considered.

而して、本実施の形態では、ヒートシンク１１と放熱ベース１３及びダクト１４によって放熱構造が構成されているが、車両２０の夜間走行等において、車両用灯具１の各半導体発光素子４に電流がそれぞれ供給されると、各半導体発光素子６がそれぞれ発光し、その青色光は、各伝送ファイバ８を経て各ランプモジュール５へとそれぞれ伝送され、黄色の蛍光体９を透過することによって白色光に変換される。そして、白色光は、レンズ１０を通過して配光が制御された後、透明なアウタレンズ３を通過して車両２０の前方へと照射されるため、車両用灯具１がヘッドランプとしての機能を果たす。 Thus, in the present embodiment, the heat dissipation structure is composed of the heat sink 11, the heat dissipation base 13, and the duct 14, but when the vehicle 20 travels at night or the like, a current is applied to each semiconductor light emitting element 4 of the vehicle lamp 1. When each of them is supplied, each semiconductor light emitting element 6 emits light, and the blue light is transmitted to each lamp module 5 via each transmission fiber 8 and becomes white light by passing through the yellow phosphor 9. Will be converted. Then, the white light passes through the lens 10 and the light distribution is controlled, and then passes through the transparent outer lens 3 and is emitted to the front of the vehicle 20. Therefore, the vehicle lighting tool 1 functions as a headlamp. Fulfill.

そして、上述のように各半導体発光素子６がそれぞれ発光すると、各半導体発光素子６が発熱するが、その熱は、基板１２と放熱ベース１３を経てヒートシンク１１へと伝導し、該ヒートシンク１１の複数枚の放熱フィン１１ｂから放熱される。車両２０の走行時においては、走行風がダクト１４の吸気口１４ａから該ダクト１４内に流入し、又、ラジエータファンの稼動によって発生する負圧に引かれてダクト１４内を排気口１４ｂに向かって空気が流れるが、その過程において、空気がダクト１４の放熱部１４Ｂに内設されたヒートシンク１１との熱交換によってヒートシンク１１の放熱を促進するため、各半導体発光素子６が強制的に冷却されてその温度上昇が抑えられ、各半導体発光素子６の発光効率と寿命の低下が防がれる。 Then, when each of the semiconductor light emitting elements 6 emits light as described above, each semiconductor light emitting element 6 generates heat, but the heat is conducted to the heat sink 11 via the substrate 12 and the heat dissipation base 13, and the plurality of the heat sinks 11 are present. Heat is radiated from the heat radiating fins 11b. When the vehicle 20 is traveling, the traveling wind flows into the duct 14 from the intake port 14a of the duct 14, and is pulled by the negative pressure generated by the operation of the radiator fan toward the exhaust port 14b in the duct 14. In the process, the air is forcibly cooled in each semiconductor light emitting element 6 in order to promote heat dissipation of the heat sink 11 by heat exchange with the heat sink 11 installed in the heat radiating portion 14B of the duct 14. The temperature rise is suppressed, and the light emission efficiency and life of each semiconductor light emitting element 6 are prevented from being lowered.

又、車両２０の停止時においては、ダクト１４の放熱部１４Ｂに内設された温度の高いヒートシンク１１の周囲の空気が加熱され、その空気の密度が小さくなるためにダクト１４の放熱部１４Ｂを上昇する空気の流れが誘起され、この空気の流れに誘発されて温度の低い外気が吸気口１４ａからダクト１４内に吸引されて排気口１４ｂから排出されるため、ダクト１４内には車両２０の走行時と同様の空気の流れが発生する。そして、ダクト１４内を流れる空気による自然空冷によってヒートシンク１１の放熱が促進されるため、各半導体発光素子６の温度上昇が抑えられる。 Further, when the vehicle 20 is stopped, the air around the high temperature heat sink 11 installed in the heat radiating portion 14B of the duct 14 is heated, and the density of the air becomes small, so that the radiating portion 14B of the duct 14 is used. An ascending air flow is induced, and the low-temperature outside air is sucked into the duct 14 from the intake port 14a and discharged from the exhaust port 14b by being induced by this air flow. Therefore, the vehicle 20 is inside the duct 14. The same air flow as when traveling is generated. Then, since heat dissipation of the heat sink 11 is promoted by natural air cooling by the air flowing in the duct 14, the temperature rise of each semiconductor light emitting element 6 is suppressed.

又、車両２０の停止時においてラジエータファンが稼動する場合は、ラジエータファンの稼動によって発生する負圧に引かれてダクト１４内を排気口１４ｂに向かって空気が流れるが、その過程において、空気がダクト１４の放熱部１４Ｂに内設されたヒートシンク１１との熱交換によってヒートシンク１１の放熱が促進される。 When the radiator fan operates when the vehicle 20 is stopped, air flows through the duct 14 toward the exhaust port 14b due to the negative pressure generated by the operation of the radiator fan. In the process, the air flows. The heat dissipation of the heat sink 11 is promoted by heat exchange with the heat sink 11 provided inside the heat radiating portion 14B of the duct 14.

ここで、本実施の形態では、前述のようにダクト１４の吸気部１４Ａと放熱部１４Ｂの壁面の断熱性を従来よりも高く設定し、排気部１４Ｃのエンジンルーム側に位置する部位の壁面の断熱性を従来よりも低く設定し、同排気部１４Ｃのフロントグリル側に位置する部位の壁面の断熱性を従来よりも高く設定している。 Here, in the present embodiment, as described above, the heat insulating properties of the wall surfaces of the intake portion 14A and the heat radiating portion 14B of the duct 14 are set higher than before, and the wall surface of the portion of the exhaust portion 14C located on the engine room side is set. The heat insulating property is set lower than before, and the heat insulating property of the wall surface of the portion located on the front grill side of the exhaust portion 14C is set higher than before.

而して、上述のようにダクト１４の吸気部１４Ａと放熱部１４Ｂの壁面の断熱性が従来よりも高く設定されていると、吸気口１４ａから当該ダクト１４内に流入する温度の低い外気の温度上昇が抑えられるため、ヒートシンク１１が温度の低い空気によって冷却されてその放熱性能が高められる。 Therefore, if the heat insulating properties of the wall surfaces of the intake portion 14A and the heat radiating portion 14B of the duct 14 are set higher than before as described above, the low temperature outside air flowing into the duct 14 from the intake port 14a Since the temperature rise is suppressed, the heat sink 11 is cooled by air having a low temperature, and its heat dissipation performance is enhanced.

ところで、ダクト１４の性能は次式で示す吸気速度Ｑで表され、この吸気速度Ｑが大きいほどヒートシンク１１の対流熱伝達率が上昇して放熱性能が高くなる。 By the way, the performance of the duct 14 is represented by the intake speed Q shown by the following equation, and the larger the intake speed Q, the higher the convection heat transfer coefficient of the heat sink 11, and the higher the heat dissipation performance.

Figure 0006762865
ここに、Ｑ：吸気速度［ｍ３／ｓ］
Ａ：通路断面積［ｍ２］
Ｃ：流量係数［−］
ｇ：重力加速度［ｍ／ｓ２］
ｈ：排気部高さ［ｍ］
Ｔex：排気部平均温度［Ｋ］
Ｔout：排気口付近温度［Ｋ］
上式[数１]においてダクト１４の通路断面積Ａ、流量係数Ｃ、排気部高さｈ及び排気口付近温度Ｔoutは一定であり、排気部平均温度Ｔexのみが変数となるため、吸気速度Ｑを上げるためには排気部平均温度Ｔexを高く設定する必要がある。
Figure 0006762865
Here, Q: Intake speed [m 3 / s]
A: Passage cross section [m 2 ]
C: Flow coefficient [-]
g: Gravitational acceleration [m / s 2 ]
h: Exhaust part height [m]
Tex: Average exhaust temperature [K]
Tout: Temperature near the exhaust port [K]
In the above equation [Equation 1], the passage cross-sectional area A of the duct 14, the flow rate coefficient C, the height h of the exhaust part, and the temperature Tout near the exhaust port are constant, and only the average temperature Tex of the exhaust part is a variable. It is necessary to set the exhaust unit average temperature Tex high in order to raise it.

而して、本実施の形態では、ダクト１４の排気部１４Ｃのエンジンルーム側に位置する部位の壁面の断熱性を従来よりも低く設定したため、この部位を流れる空気がエンジンルームの熱によって加熱され易くなり、排気部平均温度Ｔexが高くなる。このため、前式［数１］より吸気速度Ｑが大きくなって放熱性能が高められる。そして、この場合、ダクト１４の排気部１４Ｃのフロントグリル側に位置する部位の壁面の断熱性を従来よりも高く設定したため、排気部１４Ｃにおいて加熱された空気がフロントグリル側の温度の低い空気によって冷却されて排気部平均温度Ｔexの低下を招くことがない。 Therefore, in the present embodiment, since the heat insulating property of the wall surface of the portion of the exhaust portion 14C of the duct 14 located on the engine room side is set lower than before, the air flowing through this portion is heated by the heat of the engine room. It becomes easier and the average temperature Tex of the exhaust part becomes higher. Therefore, the intake speed Q is larger than that of the previous equation [Equation 1], and the heat dissipation performance is improved. In this case, since the heat insulating property of the wall surface of the portion of the exhaust portion 14C of the duct 14 located on the front grill side is set higher than before, the air heated in the exhaust portion 14C is caused by the low temperature air on the front grill side. It is cooled and does not cause a decrease in the average temperature Tex of the exhaust unit.

そして、本実施の形態では、車両２０の停止時においても温度が比較的低くて車両２０の前方への熱風の回り込みが殆どないエンジンルーム内のフロントグリル２１とコンデンサ及びラジエータとの間にダクト１４の排気口１４ｂを開口させたため、熱風がダクト１４の排気口１４ｂから流入して該ダクト１４内を逆流することがない。このため、ヒートシンク１１の放熱性能が熱風によって阻害されることがなく、該ヒートシンク１１の放熱が自然空冷によって促進されて各半導体発光素子６の温度上昇が効果的に抑えられる。 Then, in the present embodiment, the duct 14 is located between the front grill 21 in the engine room and the condenser and the radiator in the engine room where the temperature is relatively low even when the vehicle 20 is stopped and the hot air hardly wraps around to the front of the vehicle 20. Since the exhaust port 14b of the above is opened, hot air does not flow in from the exhaust port 14b of the duct 14 and flow back in the duct 14. Therefore, the heat dissipation performance of the heat sink 11 is not hindered by the hot air, and the heat dissipation of the heat sink 11 is promoted by natural air cooling, and the temperature rise of each semiconductor light emitting element 6 is effectively suppressed.

而して、以上の効果は、ファン等の機器を別途要することなく簡単な構成によって得られるため、放熱構造において大幅なコストアップや構造の複雑化を招くことがない。 Therefore, since the above effect can be obtained by a simple configuration without requiring a separate device such as a fan, the heat dissipation structure does not cause a significant cost increase or complicated structure.

尚、本実施の形態では、ダクト１４の吸気口１４ａを車両２０の前面（フロントグリル２１の一部）に開口させたが、吸気口１４ａの開口位置は任意であって、車両２０の前面には開口させず、エンジンルーム内の前端下部に前方又は下方に向かって開口させるようにしても良い。 In the present embodiment, the intake port 14a of the duct 14 is opened on the front surface of the vehicle 20 (a part of the front grill 21), but the opening position of the intake port 14a is arbitrary and is on the front surface of the vehicle 20. May not be opened, but may be opened forward or downward at the lower part of the front end in the engine room.

＜実施の形態２＞
次に、本発明の実施の形態２を図５に基づいて以下に説明する。 <Embodiment 2>
Next, Embodiment 2 of the present invention will be described below with reference to FIG.

図５は本発明の実施の形態２に係る車両用灯具の放熱構造を示す正面図であり、同図においては図４に示したものと同一要素には同一符号を付しており、以下、それらについての再度の説明は省略する。 FIG. 5 is a front view showing a heat dissipation structure of a vehicle lamp according to a second embodiment of the present invention. In the same figure, the same elements as those shown in FIG. 4 are designated by the same reference numerals. The description of them again will be omitted.

本実施の形態は、ダクト１４を車両２０のフロントグリル側に配置し、同ダクト１４の吸気部１４Ａの壁面の断熱性を高く設定し、放熱部１４Ｂの壁面の断熱性を低く設定し、排気部１４Ｃの壁面の断熱性を高く設定したことを特徴としており、他の構成は前記実施の形態１の構成と同じである。 In this embodiment, the duct 14 is arranged on the front grill side of the vehicle 20, the heat insulating property of the wall surface of the intake portion 14A of the duct 14 is set high, the heat insulating property of the wall surface of the heat radiating portion 14B is set low, and the exhaust gas is exhausted. It is characterized in that the heat insulating property of the wall surface of the portion 14C is set to be high, and other configurations are the same as those of the first embodiment.

而して、本実施の形態によれば、ダクト１４の吸気部１４Ａの壁面の断熱性を従来よりも高く設定したため、吸気口１４ａから当該ダクト１４内に流入する温度の低い外気の温度上昇が抑えられ、ヒートシンク１１が温度の低い空気によって冷却されるために該ヒートシンク１１の放熱性能が高められる。 Therefore, according to the present embodiment, since the heat insulating property of the wall surface of the intake portion 14A of the duct 14 is set to be higher than that of the conventional one, the temperature of the low-temperature outside air flowing into the duct 14 from the intake port 14a rises. Since the heat sink 11 is suppressed and cooled by air having a low temperature, the heat dissipation performance of the heat sink 11 is enhanced.

そして、ダクト１４の放熱部１４Ｂの壁面の断熱性を低く設定したため、放熱部１４Ｂに内設されたヒートシンク１１が温度の低いフロントグリル側の空気によって冷却され、該ヒートシンク１１の放熱性が高められる。又、ダクト１４の排気部１４Ｃの壁面の断熱性を高く設定したため、該排気部１４Ｃを流れる空気の熱が温度の低いフロントグリル側に逃げることがなく、従って、ダクト１４の排気部平均温度Ｔexが高く保たれ、排気口付近温度Ｔoutとの差（Ｔex−Ｔout）が大きくなるため、前式[数１]によって求められる吸気速度Ｑが大きくなってヒートシンク１１の放熱性が高められる。 Since the heat insulating property of the wall surface of the heat radiating portion 14B of the duct 14 is set low, the heat sink 11 installed in the heat radiating section 14B is cooled by the air on the front grill side having a low temperature, and the heat radiating property of the heat sink 11 is enhanced. .. Further, since the heat insulating property of the wall surface of the exhaust portion 14C of the duct 14 is set to be high, the heat of the air flowing through the exhaust portion 14C does not escape to the front grill side having a low temperature. Therefore, the average temperature Tex of the exhaust portion of the duct 14 Is kept high, and the difference (Tex-Tout) from the temperature near the exhaust port Tout becomes large, so that the intake speed Q obtained by the above equation [Equation 1] becomes large and the heat dissipation of the heat sink 11 is improved.

＜実施の形態３＞
次に、本発明の実施の形態３を図６に基づいて以下に説明する。 <Embodiment 3>
Next, Embodiment 3 of the present invention will be described below with reference to FIG.

図６は本発明の実施の形態３に係る車両用灯具の放熱構造を示す正面図であり、同図においては図４に示したものと同一要素には同一符号を付しており、以下、それらについての再度の説明は省略する。 FIG. 6 is a front view showing a heat dissipation structure of a vehicle lamp according to a third embodiment of the present invention. In the same figure, the same elements as those shown in FIG. 4 are designated by the same reference numerals. The description of them again will be omitted.

本実施の形態に係る放熱構造は、エンジンルームの温度が低い電気自動車等の車両に対して適用されるものであって、ダクト１４の吸気部１４Ａと排気部１４Ｃをエンジンルーム側とフロントグリル側に跨って配置するとともに、放熱部１４Ｃをエンジンルーム側に配置している。そして、ダクト１４の吸気部１４Ａの壁面の断熱性を高く設定し、放熱部１４Ｂの壁面の断熱性を低く設定し、排気部１４Ｃの壁面の断熱性を高く設定したことを特徴としており、他の構成は前記実施の形態１の構成と同じである。 The heat dissipation structure according to the present embodiment is applied to a vehicle such as an electric vehicle having a low engine room temperature, and the intake portion 14A and the exhaust portion 14C of the duct 14 are on the engine room side and the front grill side. The heat radiating unit 14C is arranged on the engine room side while being arranged so as to straddle the above. The feature is that the heat insulating property of the wall surface of the intake portion 14A of the duct 14 is set high, the heat insulating property of the wall surface of the heat radiating unit 14B is set low, and the heat insulating property of the wall surface of the exhaust unit 14C is set high. The configuration of is the same as that of the first embodiment.

而して、本実施の形態によれば、前記実施の形態１，２と同様にダクト１４の吸気部１４Ａの壁面の断熱性を従来よりも高く設定したため、吸気口１４ａから当該ダクト１４内に流入する温度の低い外気の温度上昇が抑えられ、ヒートシンク１１が温度の低い空気によって冷却されるために該ヒートシンク１１の放熱性能が高められる。 Therefore, according to the present embodiment, since the heat insulating property of the wall surface of the intake portion 14A of the duct 14 is set higher than before as in the first and second embodiments, the intake port 14a is entered into the duct 14. The temperature rise of the inflowing low-temperature outside air is suppressed, and the heat sink 11 is cooled by the low-temperature air, so that the heat dissipation performance of the heat sink 11 is improved.

そして、ダクト１４の放熱部１４Ｂの壁面の断熱性を低く設定したため、該放熱部１４Ｂに内設されたヒートシンク１１が温度の低いエンジンルーム側の空気によって冷却され、該ヒートシンク１１の放熱性が高められる。又、ダクト１４の排気部１４Ｃの壁面の断熱性を高く設定したため、該排気部１４Ｃを流れる空気の熱が温度の低いエンジンルーム側やフロントグリル側に逃げることがなく、従って、ダクト１４の排気部平均温度Ｔexが高く保たれ、排気口付近温度Ｔoutとの差（Ｔex−Ｔout）が大きくなるため、前式[数１]によって求められる吸気速度Ｑが大きくなってヒートシンク１１の放熱性が高められる。 Then, since the heat insulating property of the wall surface of the heat radiating portion 14B of the duct 14 is set low, the heat sink 11 installed in the heat radiating section 14B is cooled by the air on the engine room side having a low temperature, and the heat radiating property of the heat sink 11 is enhanced. Be done. Further, since the heat insulating property of the wall surface of the exhaust portion 14C of the duct 14 is set to be high, the heat of the air flowing through the exhaust portion 14C does not escape to the engine room side or the front grill side where the temperature is low. Therefore, the exhaust of the duct 14 is exhausted. Since the part average temperature Tex is kept high and the difference (Tex-Tout) from the temperature near the exhaust port Tout becomes large, the intake speed Q obtained by the above equation [Equation 1] becomes large and the heat dissipation of the heat sink 11 is improved. Be done.

尚、以上の本実施の形態では、ヒートシンクとして、フィン形状がプレートタイプのものを使用したが、プレートタイプ以外のピンタイプや剣山状、蛇腹状等の任意のフィン形状を有するものを使用することができる。 In the above embodiment, the heat sink used has a plate type fin shape, but a pin type other than the plate type and a heat sink having an arbitrary fin shape such as a sword mountain shape or a bellows shape should be used. Can be done.

又、以上の実施の形態では、熱源である半導体発光素子とランプモジュールとが伝送ファイバを介して接続されたものを使用したが、半導体発光素子とランプモジュールとが一体化してヒートパイプ等の熱輸送手段を用いてヒートシンクベースと熱的に接続する構成のものも使用することができる。そして、エーミング調整機構のため、ヒートシンクが一定範囲内を移動できるように該ヒートシンクをゴム製のガスケット等を介してハウジングに接続する構成としても良い。 Further, in the above embodiment, the semiconductor light emitting element which is the heat source and the lamp module are connected via the transmission fiber, but the semiconductor light emitting element and the lamp module are integrated to heat the heat pipe or the like. A configuration that is thermally connected to the heat sink base by means of transportation can also be used. Then, because of the aiming adjustment mechanism, the heat sink may be connected to the housing via a rubber gasket or the like so that the heat sink can move within a certain range.

更に、以上は本発明をヘッドランプとして使用される車両用灯具の放熱構造に対して適用した形態について説明したが、本発明は、車両駆動エネルギとしてエンジンを搭載したガソリン車のみに適用が限定されず、電気や水素燃料等を用いた車両に対しても適用可能であり、又、ヘッドランプ以外の任意の車両用灯具の放熱構造に対しても同様に適用可能であることは勿論である。又、本実施の形態では、半導体発光素子として、青色ＬＥＤを使用したが、青色ＬＥＤ以外のＬＥＤやレーザー等の他の半導体発光素子を光源として使用することができる。 Further, although the embodiment in which the present invention is applied to the heat dissipation structure of a vehicle lamp used as a headlamp has been described above, the present invention is limited to a gasoline vehicle equipped with an engine as vehicle driving energy. Of course, it can also be applied to vehicles using electricity, hydrogen fuel, etc., and can also be applied to the heat dissipation structure of any vehicle lamp other than headlamps. Further, in the present embodiment, the blue LED is used as the semiconductor light emitting element, but other semiconductor light emitting elements such as LEDs and lasers other than the blue LED can be used as the light source.

１ 車両用灯具
２ ハウジング
３ アウタレンズ
４ 灯室
５ ランプモジュール
６ 半導体発光素子（光源）
７ エクステンション
８ 伝送ファイバ
９ 蛍光体
１０ レンズ
１１ ヒートシンク（放熱器）
１１ａ ヒートシンクのベース
１１ｂ ヒートシンクの放熱フィン
１２ 基板
１３ 放熱ベース
１４ ダクト
１４Ａ ダクトの吸気部
１４Ｂ ダクトの放熱部（鉛直部）
１４Ｃ ダクトの排気部
１４ａ ダクトの吸気口
１４ｂ ダクトの排気口
２０ 車両
２１ フロントグリル
２２ フロントバンパ
２３ ボンネット
２４ フロントガラス
２５ 前輪
ｈ ダクトの排気部高さ
２６ サイドミラー
Ｔex： ダクト排気部の平均空気温度
Ｔout: ダクトの排気口付近温度
1 Vehicle lighting equipment 2 Housing 3 Outer lens 4 Lighting room 5 Lamp module 6 Semiconductor light emitting element (light source)
7 Extension 8 Transmission fiber 9 Fluorescent material 10 Lens 11 Heat sink (heat sink)
11a Heat sink base 11b Heat sink heat dissipation fin 12 Board 13 Heat dissipation base 14 Duct 14A Duct intake part 14B Duct heat dissipation part (vertical part)
14C Duct exhaust 14a Duct intake 14b Duct exhaust 20 Vehicle 21 Front grill 22 Front bumper 23 Bonnet 24 Front glass 25 Front wheel h Duct exhaust height 26 Side mirror Tex: Average air temperature of duct exhaust Tout : Temperature near the exhaust port of the duct

Claims (5)

光源と、該光源で発生する熱を放熱する放熱器を備える車両用灯具の放熱構造であって、一端が吸気口として開口する吸気部と上下方向に延びる放熱部及び一端が排気口として開口する排気部を備えるダクトの前記放熱部に前記放熱器を内設し、前記吸気口から前記ダクト内に流入して前記排気口から排出される空気によって前記放熱器の放熱を促進して前記光源を冷却する車両用灯具の放熱構造において、
前記ダクトの前記吸気部と前記放熱部及び前記排気部の壁面の断熱性に差を設けたことを特徴とする車両用灯具の放熱構造。 It is a heat dissipation structure of a vehicle lamp provided with a light source and a radiator that dissipates heat generated by the light source, and has an intake portion that opens as an intake port at one end and a heat dissipation portion that extends in the vertical direction and one end that opens as an exhaust port. The radiator is internally provided in the heat radiating portion of the duct provided with the exhaust portion, and the air flowing into the duct from the intake port and discharged from the exhaust port promotes heat dissipation of the radiator to promote the heat dissipation of the light source. In the heat dissipation structure of the vehicle lighting equipment to be cooled
A heat radiating structure for a vehicle lamp, characterized in that a difference is provided in the heat insulating properties of the intake portion, the heat radiating portion, and the wall surface of the exhaust portion of the duct. 前記ダクトの前記排気部を車両のエンジンルーム側とフロントグリル側に跨って配置し、同ダクトの前記吸気部と前記放熱部の壁面の断熱性を高く設定し、前記排気部のエンジンルーム側に位置する部位の壁面の断熱性を低く設定し、同排気部のフロントグリル側に位置する部位の壁面の断熱性を高く設定したことを特徴とする請求項１記載の車両用灯具の放熱構造。 The exhaust portion of the duct is arranged so as to straddle the engine room side and the front grill side of the vehicle, the heat insulating property of the wall surface of the intake portion and the heat dissipation portion of the duct is set to be high, and the exhaust portion is located on the engine room side of the exhaust portion. The heat dissipation structure for a vehicle lamp according to claim 1, wherein the heat insulating property of the wall surface of the located portion is set low, and the heat insulating property of the wall surface of the portion located on the front grill side of the exhaust portion is set high. 前記ダクトを車両のフロントグリル側に配置し、同ダクトの前記吸気部の壁面の断熱性を高く設定し、前記放熱部の壁面の断熱性を低く設定し、前記排気部の壁面の断熱性を高く設定したことを特徴とする請求項１記載の車両用灯具の放熱構造。 The duct is arranged on the front grill side of the vehicle, the heat insulating property of the wall surface of the intake portion of the duct is set high, the heat insulating property of the wall surface of the heat radiating part is set low, and the heat insulating property of the wall surface of the exhaust part is set. The heat dissipation structure of the vehicle lighting equipment according to claim 1, wherein the height is set high. エンジンルームの温度が低い車両に設けられる放熱構造であって、前記ダクトの前記吸気部の壁面の断熱性を高く設定し、前記放熱部の壁面の断熱性を低く設定し、前記排気部の壁面の断熱性を高く設定したことを特徴とする請求項１記載の車両用灯具の放熱構造。 It is a heat dissipation structure provided in a vehicle having a low temperature in the engine room, in which the heat insulating property of the wall surface of the intake portion of the duct is set high, the heat insulating property of the wall surface of the heat dissipation portion is set low, and the wall surface of the exhaust portion is set high. The heat dissipation structure of the vehicle lighting equipment according to claim 1, wherein the heat insulating property of the vehicle is set to be high. 前記ダクトの排気口を車両のエンジンルームのフロントグリルとコンデンサ及びラジエータとの間に開口させたことを特徴とする請求項１〜４の何れかに記載の車両用灯具の放熱構造。
The heat dissipation structure for a vehicle lamp according to any one of claims 1 to 4, wherein the exhaust port of the duct is opened between the front grill of the engine room of the vehicle and the condenser and the radiator.
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